Traditional colored porcelain "plain tricolor" is called "plain" because which color is not used?

The element is called because red is not used.

Plain tricolor is the pattern of colored glaze that has been engraved on the tire and then fired at low temperature. The production process is similar to that of Tang Sancai and Song Sancai, but it is made of porcelain.

In addition to yellow, green and ultraviolet, there are black and white glaze colors. Because red is not used, it is called plain tricolor. Plain tricolor began in the Ming Dynasty, and it was very beautiful in Zhengde period, and it was the most popular in Kangxi period of Qing Dynasty.

Extended data:

Tri-colored porcelain fired in Jingdezhen in the Ming Dynasty began to appear in Chenghua period, and the tri-colored porcelain in Zhengde period was the most famous. Its manufacturing method is to carve patterns on the porcelain blank of the utensils without glazing, fire it into plain porcelain at high temperature, and then coat it with glaze of a certain color.

Then the pattern part is picked out, filled with various colors (or painted on the corresponding parts of the blank with various colors respectively), and then fired at a second low temperature.

After Jiajing, there were also plain three-color firing, but more were red, green, yellow, blue and white on the glaze, and there were many kinds of colored utensils nested in different colors, which were very beautiful.

Three colors were popular in Kangxi period. It was developed and innovated on the basis of tricolor in the middle of Ming Dynasty. In addition to yellow, green and ultraviolet, glaze blue is added, and the process is more diversified.

References:

Baidu encyclopedia-Su Sancai